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Allowance for Credit Losses - Amortized Cost Basis of Financing Receivables with Loan Modifications (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Interest Rate Reduction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost Basis | $ 21,159 | $ 16,620 | $ 28,633 | $ 39,263
% of Total Class of Financing Receivable | 0.09% | 0.07% | 0.12% | 0.17%
Combination - Interest Rate Reduction and Term Extension |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost Basis | $ 449,484 | $ 90,193 | $ 937,723 | $ 254,639
% of Total Class of Financing Receivable | 1.92% | 0.39% | 4.01% | 1.10%
Private Education Loans | Interest Rate Reduction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost Basis | $ 21,159 | $ 16,620 | $ 28,633 | $ 39,263
% of Total Class of Financing Receivable | 0.09% | 0.07% | 0.12% | 0.17%
Private Education Loans | Interest Rate Reduction | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average contractual rate | 13.16% | 13.57% | 13.18% | 13.29%
Private Education Loans | Interest Rate Reduction | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average contractual rate | 3.59% | 4.00% | 3.59% | 4.00%
Private Education Loans | Combination - Interest Rate Reduction and Term Extension |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost Basis | $ 449,484 | $ 90,193 | $ 937,723 | $ 254,639
% of Total Class of Financing Receivable | 1.92% | 0.39% | 4.01% | 1.10%
Weighted average life of loans | 9 years 5 months 1 day | 10 years 2 months 19 days | 9 years 2 months 15 days | 10 years 2 months 26 days
Private Education Loans | Combination - Interest Rate Reduction and Term Extension | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average contractual rate | 12.58% | 13.12% | 12.69% | 12.84%
Private Education Loans | Combination - Interest Rate Reduction and Term Extension | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average contractual rate | 3.51% | 4.00% | 3.60% | 4.00%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 20 -Name Accounting Standards Codification -Section 40 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481628/310-20-40-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 + Details
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